NJW4155DL3-B datasheet(5/25 Pages) NJRC

Part #	NJW4155DL3-B

Description	Current Mode Control Internal 1.8A MOSFET Switching Regulator IC for Buck Converter

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Manufacturer	NJRC [New Japan Radio]

Direct Link	http://www.jrc.co.jp/eng/index.html

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5 / 25 page

NJW4155

- 5 -

Ver.2015-11-13

ELECTRICAL CHARACTERISTICS

(Unless otherwise noted, V+=VEN./SYNC=12V, Ta=25 C)

PARAMETER

SYMBOL

TEST CONDITION

MIN.

TYP.

MAX.

UNIT

Under Voltage Lockout Block

ON Threshold Voltage

VT_ON

V+= L → H

4.2

4.4

4.5

V

OFF Threshold Voltage

VT_OFF

V+= H → L

4.1

4.3

4.4

V

Hysteresis Voltage

VHYS

70

90

–

mV

Soft Start Block

Soft Start Time

TSS

VB=0.75V

2

4

8

ms

Oscillator Block

Oscillation Frequency

fOSC

A, C version, VIN-=0.7V

405

450

495

kHz

B version, VIN-=0.7V

270

300

330

kHz

Oscillation Frequency

deviation (Supply voltage)

fDV

V+=4.5V to 40V

–

1

–

%

Oscillation Frequency

deviation (Temperature)

fDT

Ta=-40 C to +85 C

–

5

–

%

Error Amplifier Block

Reference Voltage

VB

-1.0%

0.8

+1.0%

V

Input Bias Current

IB

-0.1

–

+0.1

A

PWM Comparate Block

Maximum Duty Cycle

MAXDUTY

VIN-=0.7V

92

95.5

–

%

Minimum ON Time1

(Use Built-in Oscillator)

tON-min1

A, C version

–

150

200

ns

B version

–

215

290

ns

Minimum ON Time2

(Use Ext CLK)

tON-min2

A, C version, fSYNC=500kHz

–

100

140

ns

B version, fSYNC=400kHz

–

145

200

ns

OCP Block

COOL DOWN Time

tCOOL

–

75

–

ms

Output Block

Output ON Resistance

RON

ISW=1.5A

–

0.2

0.4

Switching Current Limit

ILIM

2.7

3.4

4.0

A

SW Leak Current

ILEAK

VEN/SYNC=0V, V

+=45V, VSW=0V

–

3

A

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